contestada

the quadratic expression x^2+7x+N can be factored as (x+g)(x+h) where N,g,h are integers. Pod wrote that B could be equal to -18. Eleanor wrote that N could equal 13. Which student is correct?

Respuesta :

sqdancefan
Assuming Pod wrote that N could be equal to -18, Pod is correct.
  x² + 7x - 18 = (x + 9)(x - 2) . . . . . g = 9, h = -2

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There are no integer factors of 13 that add to give 7. 13 is prime, so the sum of its integer factors is 1+13 = 14.